Image Processing Toolbox 6.4

Spatial Transformations and Image Registration

Spatial transformations alter the spatial relationships between pixels in an image by mapping locations in an input image to new locations in an output image. Image Processing Toolbox supports common transformational operations, such as resizing, rotating, and interactive cropping of images, as well as geometric transformations with arbitrary-dimensional arrays.

Image registration is important in remote sensing, medical imaging, and other applications where images must be aligned to enable quantitative analysis. Using Image Processing Toolbox, you can interactively select points in a pair of images and align the two images by performing a spatial transformation, such as linear conformal, affine, projective, polynomial, piecewise linear, or local weighted mean. You can also perform image registration using normalized 2-D cross-correlation.

Choosing control points to register an aerial photo to an orthophoto. The control point selection tool helps you select landmark points and align images. Visible color and aerial photographs courtesy of mPower3/Emerge. Orthoregistered photographs courtesy of MassGIS. Click on image to see enlarged view.